/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.io;

import proguard.classfile.ClassConstants;

import java.io.*;
import java.util.zip.*;

/**
 * This <code>DataEntry</code> represents a ZIP entry.
 *
 * @author Eric Lafortune
 */
public class ZipFileDataEntry implements DataEntry {
    private final DataEntry parent;
    private final ZipEntry zipEntry;
    private ZipFile zipFile;
    private InputStream zipInputStream;
    private InputStream bufferedInputStream;

    public ZipFileDataEntry(DataEntry parent, ZipEntry zipEntry, ZipFile zipFile) {
        this.parent = parent;
        this.zipEntry = zipEntry;
        this.zipFile = zipFile;
    }

    // Implementations for DataEntry.

    public String getName() {
        // Get the right separators.
        String name = zipEntry.getName().replace(File.separatorChar, ClassConstants.PACKAGE_SEPARATOR);

        // Chop the trailing directory slash, if any.
        int length = name.length();
        return length > 0 && name.charAt(length - 1) == ClassConstants.PACKAGE_SEPARATOR ? name.substring(0, length - 1)
            : name;
    }

    public String getOriginalName() {
        return getName();
    }

    public long getSize() {
        return zipEntry.getSize();
    }

    public boolean isDirectory() {
        return zipEntry.isDirectory();
    }

    public InputStream getInputStream() throws IOException {
        if (zipInputStream == null) {
            zipInputStream = zipFile.getInputStream(zipEntry);
        }

        if (bufferedInputStream == null) {
            bufferedInputStream = new BufferedInputStream(zipInputStream);
        }

        return bufferedInputStream;
    }

    public void closeInputStream() throws IOException {
        zipInputStream.close();
        zipFile = null;
        bufferedInputStream = null;
    }

    public DataEntry getParent() {
        return parent;
    }

    // Implementations for Object.

    public String toString() {
        return parent.toString() + ':' + getName();
    }
}
